CAREER: Spatiotemporal Behavior of Stimuli- Responsive Soft Materials in Non-Equilibrium Processes

职业：非平衡过程中刺激响应软材料的时空行为

• 批准号: 2048219
• 负责人: Lihua Jin
• 金额: $ 62.46万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-08-15 至 2027-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2048219&HistoricalAwards=false
• 关键词: CAREER; Spatiotemporal; Behavior; Stimuli; Responsive

This Faculty Early Career Development (CAREER) grant will investigate the non-equilibrium kinetic processes of stimuli-responsive soft materials (SSMs). SSMs can change their structures, shapes or functions in response to external stimuli, such as heat, chemicals, light radiation, electrical fields, or magnetic fields. Triggered by an external stimulus, a SSM evolves from one equilibrium state to a new one through non-equilibrium kinetic processes, including diffusion, reaction, viscoelastic relaxation, etc. The kinetic processes not only determine the response speeds of SSMs, but also govern how they spatiotemporally evolve their structures, shapes and functions. Understanding the response kinetics is a key step to designing programmable SSMs, and developing emerging techniques, such as 4D printing, self-folding origami, and self-propelled robots. By unraveling the coupled kinetic processes, and the interplay of kinetics with inertia and gravity, this grant will achieve programmable reconfiguration, oscillation and locomotion of SSMs. This grant has broader impacts in education and technology. It will provide training opportunities to a diverse group of undergraduate and graduate students through teaching, researching and advising. The research work will be included into graduate classes, developed into demonstrations for K-12 outreach activities, and widely disseminated in conferences. The long-term deliverables of this grant are SSMs with programmed and dynamic stimuli-responses, which will have impacts on soft robotics, biomedical devices, energy harvesting, and reconfigurable structures.The objective of this grant is unraveling coupled non-equilibrium kinetic processes and the interplay of kinetics with inertia and gravity in SSMs to control their spatiotemporal responses. Specifically, the grant will (1) unravel coupled non-equilibrium processes to achieve programmable reconfiguration, (2) utilize coupling of kinetics and inertia to enable autonomous oscillation, and (3) harness interplay between kinetics and gravity to attain controlled locomotion. Three model SSM systems, including photo-thermally responsive shape memory polymers, photo-thermally responsive hydrogels, and humidity-responsive polymers, will be analytically modeled by a nonlinear non-equilibrium field theory, computationally simulated, and experimentally fabricated and characterized. The success of the grant will advance the field of multiphysics constitutive modeling on predicting spatiotemporal behavior of SSMs, and provide design guidelines for SSMs to achieve programmable spatiotemporal reconfiguration, and fast and dynamic motion.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该学院早期职业发展（CAREER）资助将研究刺激响应软材料（SSM）的非平衡动力学过程。SSM可以改变其结构，形状或功能以响应外部刺激，例如热，化学品，光辐射，电场或磁场。在外界刺激的作用下，固态磁膜通过扩散、反应、粘弹性弛豫等非平衡动力学过程从一个平衡态演化到一个新的平衡态。动力学过程不仅决定了固态磁膜的响应速度，而且决定了它们在时空上如何演化其结构、形状和功能。了解响应动力学是设计可编程SSM和开发新兴技术（如4D打印、自折叠折纸和自推进机器人）的关键一步。通过解开耦合动力学过程，以及动力学与惯性和重力的相互作用，该赠款将实现可编程的重新配置，振荡和运动的SSM。这项赠款在教育和技术方面具有更广泛的影响。它将通过教学、研究和咨询为不同的本科生和研究生群体提供培训机会。研究工作将被纳入研究生课程，发展成为K-12外展活动的演示，并在会议上广泛传播。该基金的长期成果是具有可编程和动态刺激响应的SSM，这将对软机器人，生物医学设备，能量收集和可重构结构产生影响。该基金的目标是解开耦合非平衡动力学过程以及SSM中动力学与惯性和重力的相互作用，以控制其时空响应。具体来说，该赠款将（1）解开耦合的非平衡过程，以实现可编程的重新配置，（2）利用动力学和惯性的耦合，使自主振荡，（3）利用动力学和重力之间的相互作用，以实现受控的运动。三个模型SSM系统，包括光热响应的形状记忆聚合物，光热响应的水凝胶，和湿度响应的聚合物，将分析建模的非线性非平衡场理论，计算模拟，实验制造和表征。该基金的成功将推动多物理场本构建模领域的研究，以预测SSM的时空行为，并为SSM提供设计指南，以实现可编程的时空重新配置，以及快速和动态的运动。该奖项反映了NSF的法定使命，并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。

项目成果

Photo-induced spatiotemporal bending of shape memory polymer beams

• DOI: 10.1088/1361-665x/ac9d75
• 发表时间: 2022-10
• 期刊: Smart Materials and Structures
• 影响因子: 4.1
• 作者: Boliang Wu;Tianzhen Liu;Yuzhen Chen;Lihua Jin

Photodriven Self-Excited Hydrogel Oscillators

• DOI: 10.1103/physrevapplied.17.014007
• 发表时间: 2022-01
• 期刊: Physical Review Applied
• 影响因子: 4.6
• 作者: Chen Xuan;Yu Zhou;Yusen Zhao;Ximin He;L. Jin

Spatiotemporally Programmable Surfaces via Viscoelastic Shell Snapping

• DOI: 10.1002/aisy.202100270
• 发表时间: 2022-05-29
• 期刊: ADVANCED INTELLIGENT SYSTEMS
• 影响因子: 7.4
• 作者: Chen, Yuzhen;Liu, Tianzhen;Jin, Lihua
• 通讯作者: Jin, Lihua

Buckling of viscoelastic spherical shells

• DOI: 10.1016/j.jmps.2022.105084
• 发表时间: 2022-10-07
• 期刊: JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
• 影响因子: 5.3
• 作者: Liu, Tianzhen;Chen, Yuzhen;Jin, Lihua
• 通讯作者: Jin, Lihua